In this article from 1831, which itself is a reprinting of her preface to one of the book's early editions.
Neat. Though she left out the part where Percy was running around showing his, um, percy to all of the other tramps in town.
Well, it was the Guardian, not News of the World.
Mary Shelley is dead, man.
Well, it was the Guardian, not News of the World.
I've got to start checking out the NotW online.
Oh wait! I think they got shut down a while back. Before I developed the Don Juan avatar.
(Watch out, lurkers, or you will start measuring time in Paizo threads! This could be you!)